It is usually held in trust but the trust can be used before they reach the age it is due for essential expenses such as tuition fees, physiotherapy etc
Is it a car for them to drive when they get to 17 or does mum need a specially adapted car now to drive them round in- if the latter then that should be included in the claim. Claimant solicitors rarely miss a trick and will possibly have asked for a new house or major alterations