Can my step father put me on the reverse mortgage even tho im not his blood son?

Im told he had to add my step sister, but this just doesnt seem right. Apparently the lender required him to add her and not me because I am just his step son.Can my step father put me on the reverse mortgage even tho im not his blood son?
I don't understand this question at all, you should ask it on a subject about mortgages or banks.

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