Ok. You do need a conveyancing solicitor.
It's not uncommon at all to buy a house in unequal shares.
The reason you should be buying in joint names is because if you do split up, the divorce court doesn't care that it was bought just in your name. It will make whatever order is fair in the circs, with first priority being homing the kids if they're still minors.
By specifically doing a declaration of trust when you buy the house, you're circumventing the presumption of equality by saying, look, this is what was agreed by us when we bought the house. The court can still deviate from that, but is much less likely to if you can show that both of you went into the purchase with your eyes open and on the clearly stated understanding that you'd get your mum's inheritance back. Nothing is ever cast iron, but this would be the safest way to do it.
So far as the paperwork is concerned, the cheap and cheerful way of doing it would be to state on the transfer deed TR1 (the doc. signed by the sellers and you formalising the transfer of ownership) that you're buying in unequal shares. That would be just a few words in a small box.
The less cheap but safer option would be to do the above, but backed up by a declaration of trust in the terms I mentioned yesterday.
Maybe the person you saw today was a wills and probate person, I dunno. It's definitely a conveyancer you need to deal lwith the declaration of trust.
I agree you should do a will as well. If you buy as joint tenants and don't do a will, your share (assuming it's less than the IHT threshold) will automatically pass to your dh so potentially he could blow it. If you want to ensure that your kids inherit, then you should prob. buy as tenants in common and do a will leaving a life interest in the property to dh, so when he dies, your share goes to the kids whether he disposes of his share separately (eg to a new wife) or not.
The life interest can have a portability clause in it so if he wants to move he can.
So in a nutshell, you need to
- Find a house
- Instruct conveyancing solicitors that you're buying in unequal shares and ask them to draft a declaration of trust (and your dh takes sep. legal advice before signing it)
- Instruct a wills and probate solicitor to do a will, pref. with a life interest in the property to your dh.