Thank you for your question..
Exempted gifts -
Each year you can give away wedding or civil ceremony gift up to £5,000 for a child .. it is implied that the gift is per child.. If two children were to get married in the same tax year the exempted gift will be £10,000.
More information on this can be found here ... look at this
Gifts to people getting married Up to: £5,000 from each parent of the couple; £2,500 from each grandparent or more remote relative; £2,500 from bridegroom to bride (and vice versa) and between civil partners; £1,000 from anyone else.
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