Godmother to my estranged cousins baby

Recently i (F20) got asked by my estranged cousin (f21) if i could be the godmother to her newborn. i dont know what do say.

I estranged myself from my dads side of the family when i was 13 because of issues with his then girlfriend at the time, mental abuse and physical abuse of my two brothers. that resulted in no contact with any of my relatives besides a few meetings with one aunt (my cousins mom) for many years.

one year ago i moved to study, resulting in being geographically closer to my relatives, and when my little brother came to visit me he wanted to go see them, as we both, quite frankly miss them. this is the first time ive seen most of them in 7 years. this was in early may, and my cousin who was there, was due in late may. after the visit we didnt have any contact besides my aunt sending me a snapchat of the newborn.

suddenly i get a massage from my cousin where she wants me to be the godmother. i am really honoured being asked, but i barley know my cousin anymore, and i am unsure of how much she actually wants me to be the godmother. i am scared this might be used as a ploy to get me “trapped” back into my family, and as a way to get me to talk to my dad again. and i heard he has broken up with his nasty girlfriend and is regretting the way things ended, noone of his children talk to him regularly) i am also scared of hurting my older brother by saying yes to this, as he absolutely does not want to have anything to do with them. then again i feel like its rude to say no. any advice?