M.W.
S.,
Do you have an attorney? Has ie been determined by the court that you both have custody?
If you have grounds for you concerns, other than family drama, you could get supervised visitations.
On the other hand, I can understand your frustration, but they are looking out for their son, you'd do the same for you daughter if she went through this.
I don't think they don't care about your daughter either, sounds like they may be a bit too nosey but you can set clear boundaries with them.
You can simply tell them that they can ONLY see her when your ex has them and the rest of the time they'll have to deal with the situation.
Always be respectful but very clear even if you have to write it down to read it on the phone when you tell them your boundaries.
Also, either your ex is a total push over or you're trying to put the blame somewhere and the likely candidates are his parents, I also know there are some parents out there that know NO boundaries but you can live peacefully setting limits with them. You could also take advantage of their desire to be with her and use them as baby sitters ;)
You are very young and I know at your age I didn't know how to handle human relations as well as I do now, I will be happy to walk you through any situation with logical advice on how to handle situations with them.
Be patient, as time passes this will be behind you and they will always be grandma and grandpa, your daughter is fortunate to have them if they are good to her and you will really benefit from allowing her to be loved by others ;)