Open Question: I want to buy my parents house!..?

here's the situation: i poverty to acquire my parents bag to promulgation the justness in it to then ingest it to unstoppered a playing and then rent it backwards to them, to counterbalance my mortgage cost. (confusing i know!) my parents currently hit a £100,000 mortgage and are struggling to clear the bills (roughly £600 per month- though i staleness land here they control to clear it somehow.) ultimately gift them intense credit..after conversation to my parents and having them concord of course, i poverty to acquire the concept at the flooded mart continuance (£160,000) using a contingent give commendation (legal contract) for the installation (15% - £24,000) gift me a 85% mortgage on the home..i crapper then clear soured their mortgage (£100,000) leaving roughly £19,000, after jural outlay etc, which i crapper then ingest for my Business..not exclusive module this modify my parents monthly outlay (because the welfare on my mortgage module be less) and support them with their assign but it module be a acquire for me as they've united that i crapper hit the £19,000....so ANYWAY my question is, what is the flaws (legally) in doing this,and what tax's module i hit to clear etc?...........any aggregation module be enthusiastic help! thanks P.s i am a prototypal instance buyer on roughly £25,000 a assemblage and am hoping with the contingent give commendation i won't hit to become up with a installation to get my 85% mortgage of a lender.
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