You might go to support other family there who were close to the deceased. I do not think you are obligated to go though--especially if travel (expense) is involved. DH missed his cousin and uncle's funerals (he was clsoe to both) because it was costly to go. His aunt made sure all the far flung relatives knew she did not want them to feel they needed to come. I missed my grandfather's becasue I was 8 months pregnant and not allowed to fly.
Honestly (I will probably be cruxified for saying this

) when my mom's boyfriend died very suddenly I thought about whether I would go to my own parents' funerals IF I could not get to them in time to see them alive. Meaning, if one of my parents were very ill in the hospital I would hop a plane in an instant and figure out how to pay off the credit card later. But if they died instantly and I only knew about it after the fact, I am not sure that I would spend the probably close to $3000 for my one last minute plane ticket to Mexico from Germany to then have to deal with my grief alone on a plane for 20ish hours just to be there for mostly the show. I have no siblings. I have never met any of mom's friends in Mexico (we don't get to see each other too often and when I do go there she wants us all to herself--my Dad is very reclusive and does not have many friends; I have met his girlfriend but really do not feel a connection to the girl at all and she would have her family there to support her--whereas I would have no one). Essentially, I would not be there to support anyone. I love my parents dearly and am very close to them both. I make an effort to be conencted with them in life. Hopefully I will not be in a situation to have to make a decision about this at any point.