There can be a genetic link as it is found to hereditary in family
If you say ' hereditary ', you don't need to say i n a family. Say eg There can be a genetic link as it is found to be hereditary. There can be a genetic link as it is hereditary.
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If you say 'hereditary', you don't need to say in a family.
Say eg
There can be a genetic link as it is found to be hereditary.
There can be a genetic link as it is hereditary.
I wonder if you mean may be rather than can be.
Clive