It would very much depend on the individual family. Itās so rare to have quadruplets that thereās no role-model or set āway to do itā, and it would depend entirely on the story or narrative the parents and siblings come up with. Iām a mother of multiples, just twins, but still. Our friend and neighbor is part of a triplet and one of his sisters died. There is a lot of constant explaining for other people who want to know about multiples and you just keep explaining it through your life when people ask because there is really no short-cut.
Our neighbor still views himself as one of a triplet group and if you ask him about his siblings then thereās no easy way to tell the truth about it without saying āIām a triplet, but one of my sisters died.ā It would also depend on when the sibling died and if the family was trying to make the story easier (less painful) for the kids to tell. If a quad sibling was never born then I can imagine how it would be easiest to just say āWeāre triplets,ā but if the sibling was alive for many years, then it would be too sad and would probably feel like a lie for the teller to say āWe are now tripletsā. Even with kids when they know they had a sibling who died in the womb they might say so unless theyāve been led by their parents in how to answer these questions just because they are trying to tell the complete truth like most kids try to. Multiples questions are rarely easy and usually (even with my twins) you know nobody is really going to understand the circumstances unless they also have twins. I saw a show where a family of quads saved up and took a flight across the Atlantic to meet and spend time with another family of quads who were a bit older, just because you really have no one to ask for advice from. You really feel you are reinventing the wheel all the time.
When people ask us if my kids are identical, I could either launch into an explanation about how girl/boy twins canāt be identical or I can just say āNo, theyāre notā and honestly I tailor my answer on whether the person actually seems intelligent and interested. For instance, if a woman who is pregnant with twins wants to know, then I am going to explain it to her because she will need to know. Then Iām going to maybe tell her about other twin stuff.
My kids? It was interesting through the years to watch them come up with their story based on the ones we were telling them ans when Iāve watched shows about quads that seems to be what is happening too, they piece their explanations together based on what mom and dad assert is true about them.
That was the long answer because of your interest, I hope it helped.