It is still 31% in other groups who hide their lack of beliefs from their family.
As a gay person who came out back in 1985, I know that as more gay people came out, it got easier for all gay people. Perhaps more atheists should be more honest about their lack of beliefs as well (come out as atheist).
I'm not gay and not black but the only ones left in my family that would give a damn are my 2 daughters. Unfortunately the pandemic, a murdered grandson, and wishful thinking has made my kids turn more towards a god belief. I get told often that "I believe in my own way." That's when I tell my kids everyone else feels that way too. This is why there are so many damned religions.
When I came out atheist my mother and sister were already dead. Sometimes my stepdad told me "you are going to split hell wide open." Now he is dead too. BTW, the biblical hell started in the grave and now its location has changed and moved over time. Myth does that sort of thing.
The only person I ever hid my atheism from was my grandmother, and there were two reasons:
I used to hide my status back in my teens and had planned to ever onward, but Facebook (though an unfortunate comment on a very amusing but offensive depiction of Jesus Christ) ended up thwarting that plan. Though it took about 2 years (and resulted in me skipping that years Holiday gathering), it all ended up better in the end.
After awhile, no one seemed to care. Some cousins openly acknowledged that they were not really religious to begin with. And others experimented outside of their childhood conditioned beliefs.
I never tried to deconvert anyone. But I can't help feeling that I kicked the door open for many to at least examine what they had never really considered before. Which is all I can ask for.
Those where it matters, or I am in frequent contact with, yes. Those who don't need to know, no. I don't lie, if asked I tell them, but I don't bother to offer the information without being asked. I don't lie, but I don't advertise, I guess.
It's nobody's business anyway. And, I don't see it as "hiding".