I think Lucia might be Hunters daughter, not Drew. while bad ends are not-canon, what they say could still hold some value. Like in the bad end where Hunter goes missing. Ophelia finds out that Hunter was been dead on paper for years. it gives us expanded lore. In the Party bad end, Lucia straight out says Hunter is her father, not might be and Hunter didn't correct her. Maybe he didn't care what she was saying.
Then again, this was all non-canon talk and maybe even expanded lore in non-canon might be just thrown in for fun.