I can understand a parent wanting to ensure their share of the estate goes to the children and not a future wife / husband.
Unfortunately I can not see a perfect solution however a will is written.
Certainly the parent has got to have powers to sell the house and substitute it with one of a similar value while they are still working as they may become redundant and may have to move to a different part of the country to find work.
Also it is OK to say the parent has the right to live in that house until he / she passes away but the house may become unsuitable as the parent ages and they may want to move to a different type of property and it can cause problems if the children will not give their consent for the property change.
Life is full of uncertainties and a will written now may not suit circumstances in a few years time.
Mark
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