Yes, it's something that can occur in relationship a few months in. Some find it a funny act while others not so much. I have never dated anyone who was an open farter, so I can't personally say it would be bonding for me. My first thought is it wouldn't be for me. I have farted in front of partners and it is almost always not welcomed, lol.
Your story is unique in that it is a family fair. I haven't met anybody or least I know of someone who participates in such a thing. Haha Fart family. I'm not judging, if it's acceptable in ones family circle, than so be it.
Thanks for the information. Interesting but I won't be joining the #fartmovement haha. Take care bud :)