Simplify the following text for a Grade 10 native English-speaking person.
Original: A son and a daughter , Daniel ( 1751 -- 1754 ) and Frances ( 1753 -- 1757 ) , died in childhood , but two other children , John ( Jacky ) Parke Custis ( 1754 -- 1781 ) and Martha ( `` Patsy '' ) Parke Custis ( 1756 -- 1773 ) survived to young adulthood .
Simplified: She had four children named John ( Jacky ) Parke Custis ( 1754-1781 ) and Martha ( `` Patsy '' ) Parke Custis ( 1756-1773 ) survived to young adulthood by Custis .