Celebrations and Customs

Unintentionally purchasing a heart shaped doughnut on Valentine's day

Q: I bought a donut from Dunkin Donuts because I was hungry and it ended up being heart shaped because of Valentine’s Day. I do not celebrate Valentine days and did not know that it would be heart shaped. I was not sure if I should return the doughnut but did not want to waste food so I ate it. Did I commit kufr or a sin ?

Celebrating birthdays

Q: I want to ask regarding celebrating family kids birthday parties. My in laws are not very religious so if someone's kid in their family celebrates a birthday party or celebrates a birthday party at home, what should I do?

I tell them that birthdays are not allowed in Islam and they even say "yes we know, we just doing it to keep the kids happy they can get toys or clothes on this occasion". If I don't go then my husband and in laws get upset and they tell me that I am not part of the family.