The conditions related to claiming 2 property as self occupied is as under:
Where the property consists of a house or part of a house which—
(a) is in the occupation of the owner for the purposes of his own residence; or
(b) cannot actually be occupied by the owner by reason of the fact that owing to his employment, business or profession carried on at any other place, he has to reside at that other place in a building not belonging to him,
the annual value of such house or part of the house shall be taken to be nil.
Thus, 1 house is already occupied by your parents so that becomes self occupied and other one is empty so you could claim it as self occupied under point no. 2 above as you cannot occupy the house due to your business or employment.
Hence, I don't think there would be any issue.
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