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Mrs Wilson is 3 years younger than her husband who is twice arnold as their son.
The son is 5 years older than 1/5 the sum of his parents ages.
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Maybe you meant to write this way:
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Mrs Wilson is 3 years younger than her husband who is twice as old old as their son, Arnold.
The son is 5 years older than 1/5 the sum of his parents ages.
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Mrs. Wilson (Mother) 2A-3
Husband 2A
Arnold (son) A
According to the description,
.
.
.

Mrs. Wilson (Mother) 41
Husband 44
Arnold (son) 22