We are considering selling our house & buying a property with my widowed mum. It's likely ownership would be 50/50 and she'd own her share outright, we'd have a mortgage. I'm trawling the internet for advice, but struggling on a few areas... eg:
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part of the point of this is so that if my curently healthy mum (aged 63) were to become ill, we would care for her BUT if she became seriously infirm and needed care, would we have to sell to release her share of the home to pay for this?
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could our 50% share be 100% loan - would a m/g company consider this or would the same rules apply as for any m/g? For example, if we need £125 m/g, they would stipulate we provide 5-10% deposit (or whatever) or might they make other conditions linked to my mum's part-ownership?
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presuming she dies before us, I have a brother and sister who would be entitled to a third of her share of the property. I'm thinking that should she die in the fairly short term we have to make a provision such as we would have to sell the house to release the inheritance but deduct our moving costs first - does that sound usual? If she - hopefully - dies in the longer term (10+ years) I guess we may be able to afford to re-mortgage to release the 1/3 share for my bro & sis - again, is this a fairly standard way to deal with this?
I just need to know what we might be facing before we go ahead - where to start? I guess we should consult a solicitor, but, erm which kind? 
Thanks for any guidance...