It's an election year - so I'm sure I'm going to have to reference this Tweet a lot - but it is important to remember that supporting the Democratic Candidate for president doesn't mean I explicitly endorse every decision Biden or The Democrats make.
Cancer is a serious matter and not something to make light of. Instead of jokes let this be an opportunity to educate people on some ways to avoid genetic illness, such as limiting sun exposure or not having your parents be cousins.