legal rights

what are my ex boyfriends/my daughters dads parents rights (my daughters dads parents) to take her on vacation? he’s a typical 17 year old, hanging out with girls etc, and i know the only reason he’s asking me to take her on a 3 week vacation is because his parents want to spend time with our daughter. trust isn’t really the problem, it’s just the fact that i know him and his family too well..... like i know that his mum will pressure me wanting to take her and then she’ll say to my kids dad “oh you do know that she’s your responsibility right” when he didn’t want to take her to begin with. my daughters never been a day without me in her life (she’s 3) and i have no idea how me, her dad, or she will cope. he gets really nervous like he’s not a bad dad or anything, he just gets nervous when she cries because i’m always there when he visits her to help out.

me and him are both underage so i have no idea what will happen! is it possible for my daughters grandparents to force her dad to take her on holidays? i haven’t told my parents yet but i know they’ll agree with me not thinking it’s the best idea. help!!