Ok, so here is the deal. I (31f) have a very traditional grandfather, Deep South type, to put it kindly, who is very anti-LGBTQ+ and vocal about it. He said plainly that he'll disown anyone in the family who chooses "alternative" lifestyle. Grandfather is currently 82.

I also have a FtM fiance, he is post-surgery and on HRT, tall, burly, has a full beard, so basically, looking at him, it's very hard to tell that he is trans. My grandfather certainly didn't see it and still thinks we are a traditional cis!hetero couple.

From my mom, his daughter, I know that grandfather plans to leave a substantial amount of money to his kids, grandkids, and greatgrandkids that he considers "family", and she knows that grandfather has already struck out one of my cousins that came out as bi. So I talked to my fiance and he says that we should totally pretend to be a hetero couple for family gatherings until grandfather passes. I am uneasy as we'd essentially be lying to my family for who knows how long, and deceiving an old man for inheritance. So, Reddit, WIBTA if I went with it?