I’m not fully understanding your question. Did you or your sister receive Form 1099-S because you were on the deed? And why were you on the deed? Are you co-owners?
If you and your sister received “a split of the sale” then you and your sister are responsible for reporting your share of the sale income. Your mom should not report all the proceeds if she did not get all the proceeds.
If the three of you were on the deed then split the sale according to your ownership percentages.
If one person received a Form 1099-S then they would issue Forms 1099-S to the other owners.
See Tax Expert DianeW777’s advice in “Sold co-owned house and only for one 1099-s.”
@dulcedp
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