The idea is she will sell her house, we'll sell ours and then we pool our resources to get somewhere with an annexe for mum. How do we do this - I'm sure there are legal/ tax ramifications we haven't considered like what happens when mum dies (she's 72)? Do we buy as tenants in common (as me and DP are currently)? How do we split the ownership - her contribution will be well in excess of ours?
Basically, has anyone done this and what do we need to know before we get too far down the road of falling in love with beautiful houses? 