Jumping is commom especially in small dogs. Jumping up is how they greet each other since they are so small; they want to be at your level or the bigger dogs level. Also, small dogs are usually more hyper. Plus, you pom is still a puppy at only 3 months old so she should have a lot of energy and want to play. Basically it is normal. This happens to my dog too with small dogs since she is so big; They just want to play with her but she would never bite them.
If she is really bugging your parents dogs and you can see their dog is really getting unhappy then you should keep her on a leash to keep her away. If your parents dog is older then he probably doesn't want to play! If your parents dog is not aggressive and has no problems with other dogs then I wouldn't really worry about him biting her.
I don't think there is really any way to stop her from trying to play with your parents dog. All you can do is keep her on a leash or in a seperate area. You could also try giving her toys to play with so she wants to play with them and not the other dog or something to chew on like a raw hide so she is kept occupied for a while. As long as she is not jumping all over you or your parents then this is pretty normal and acceptable behaviour.
If she is a hyper active puppy with lots of energy then try exercising her more, taking her to doggy care and just geneal play to get some of that energy out. Try walking her before you go to your parents house so she will be tired and not want to play.
Just a few suggestions but really this is very normal for a puppy and is not something to be worried about. Good luck
