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A person is not entitled to inherit under a Will until they reach the age of 18. Therefore, if you were to leave a legacy to someone who is under 18 at the date of your death, the Executors/Trustees would be under a duty to invest this money in their names, as Trustees or put it into a Building Society account in the child's names, but with them named as Trustees.
You could leave a legacy to the child's parent, stipulating that the monies are to be used for the benefit of the child. However, as the beneficiary of this legacy is the parent, he or she is not under any legal obligation to use the money
for their child. You would just have to hope that they complied with your wishes and do indeed use the money for the benefit of their child.
I hope this assists and sets out the legal position.