I am considering buying a property for my sister and her husband. It seems they cannot get another mortgage -. She bought a house -value 240K in 2007 and is paying this mortgage ( along with rental income received). They got married and lived there for a while but have since moved out to live with his mother. long story short . my sis wants her own independence and a property in a neutral location - rural .( the reason they moved is that he did not like the town and is from a farming background. He has land and they were going to build but ...the mortgage is the problem. they both work- his income is not fixed but not a problem. they are renting the property in town at moment. longer story short- If I was to buy this new property - what way should i go about getting them to pay the mortgage(125K) and what tax implications are in it for me (us). I am in a permanent pensionable job and my husband is self employed and also company director