Seems like a stupid thing to wind yourself up about 
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She wouldn’t be giving my kids drinks anymore
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Lmao seriously? They gave your child a drink, if you didn’t want them to have a sippy cup, you should have had a different cup or bottle for your kid. Out of all the things to be mad, you chose this? 
It’s her house, and she doesn’t want any spills, or won’t kill the kids. I find being cooperative with older folks is a winner, or it will bite you in the butt.
I wouldn’t even care at all. Why let little things like that bother you? She probably didn’t want your kid to spill their drink and I can’t blame her for that, and neither should you. It’s not any kind of big deal so just let it go and move on. Of she doesn’t want to deal with you kids messes from using a regular cup that’s her right if she’s watching the kid or they are at her house. God.who cares. Kids that are new to registry cups always spill them. Heck my 7 year old spills her regular cup at least every other day.
I imagine its her attempt to either take short cuts babysitting or spoil the child. Either way, i wouldnt care too much. Id be happy that she wants to babysit or bond build. Its more important in the bigger picture
Why would that be a big deal maybe she don’t want stuff spilling all around her house … that’s petty to be mad about
It’s a cup. Give it when she’s over put it up when she’s not. Can the child unscrew the top? Let the kid lose the top but keep the cup. It’s not that big of a deal. There are worse things than a sippy cup for a kid, how old is kid?
There are women and children being murdered in their homes while they sleep over in Israel but sure let’s draw the line on sippy cups
Who cares! She’s their Nana, she probably misses her kids being young and the things she did for them, just let her do her thing, the kids will love her and remember these memories which is more important than a sippy cup fight! Seriously
Even the most Adults of us can knock over a drink. Safety 1st
Wouldn’t bother me at all. Basically we all use sippy cups with the various cups we have I have no issue. I’m certainly not gonna argue over a sippy cup seems too small to worry about.
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Do you drink from a cup with a lid so you can take it with you and it won’t get cold or hot quick or spill in the car? Same thing lol.
I would tell then to have fun with it and just humor grandma
We do cups with lids for the gbabies at my house. I don’t want their drinks spilled on my carpet.
If she did it to be defiant, I’d be upset and set her straight. If she genuinely forgot, I’d give her some grace. The matter boils down to her history. Does she have a history of respecting you as the parent of your children, or does she have a history of steamrolling your rules and being disrespectful?
In and of itself- no big deal.
Our general relationship, how often she undermines/disrespects me, etc, how much time my kid is around her and other factors are what would escalate this tiny instance.
Pick your battles. Life to short to worry about little things
They’d say something before I would and probably ask if Grandma was feeling okay lol (my kids are 16, 17 and 23).
How many $30- $50 “sippy” cups do you have? You know the ones I’m talking about…uh huh, those. Yep. No difference other than style & price 
Welcome BACK to toddler hood 
it’s great here!!
So
What are adult water bottles and therm coffee cups
Sippy cups
Let it go
I personally wouldn’t allow it because they damage your teeth over time. You can simply get them a bendy straw thermos/cup for her house.
Maybe she was afraid they spill so she used it .
I get where you’re coming from but in this day and age, everyone is drinking out of a sippy cup. Spill proff coffee mugs, Yeti’s, I drink from a Hydroflask more often than not.
Good lord! I can’t with this!
There are much bigger issues that are worse than this. I wouldn’t be upset by this.
Nothing. Absolutely nothing. Because why does it my after?
My kids are 13,11,7 and 6, they still use cups with lids in the car in thier room , no issues, think it a little ridiculous that something that prevents spills and messes gets you annoyed, I think you need to relax a little, remember your parents and in laws have raised their own children, trust their judgment and rules of their home
I wish I had grandparents for my kids, I wouldn’t care what they had to drink from 
Be grateful your MIL is in your kids life. You’re going to be mad over a sippy cup? You’re petty af. Just stopp.
If it’s at her place leave it there. She obviously doesn’t want the kids messing drinks around her home.
Just don’t take it home with you.
If she brought it to your home, then just donate it to someone would appreciate it.