An apartment and house are different, and clue number 3 does not indicate they are interchangeable, but gives the implication that the house the third basemen and Jones reside contains more than one apartment. Your reference to clue 13 to which it states that Adams lives in a house does not preclude the possibility that Adams may reside in an apartment of an apartment house, not does it state that Adams' sister and Adams lives in the same apartment. From that clue the two siblings could reside in the same or separate apartments -- or in no apartment as the house they reside may, in fact, not be an apartment house, but may be single unit, duplex, or other type of residential house.
An assumption that only a non-bachelor could have children contradicts evidence of reality. Yet, in order to find a solution with the givens, it may be one of the assumptions that is needed to be made. Another assumption that might be taken is that one engaged to be married is a bachelor -- even given that the assumption is partially contradicted by clue 15, with divorce being recognized.