@EKMfox,
Let his father take some time to sort himself out.
He may recognize that he is not prepared to deal with the child at this time.
Is there anyone else in his family who would be a good temporary substitute visitor? connection to his paternal family may still be good.
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The man wanted to attempt suicide two months ago. That is very very recent.
Let your son's father (or his family) initiate contact.
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Keep very good records of dates of contact/attempted contact.
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Is there a rush to change the custodial arrangement for some reason?