sentences:  When Child's wife's cousin Ann Tylney died in 1730, Dorothy and her husband Viscount Castlemain inherited the Tylney estates.Castlemain was created 1st Earl Tylney the following year (1731) and in 1734 obtained an Act of Parliament to change the name of his family, including his heirs, from the patronymic to Tylney, probably to meet a condition of his wife's inheritance.On the death of the Earl in 1750 he was succeeded by his 38-year-old son John Tylney, 2nd Earl Tylney.