He is not your mahram and you are not allowed to be uncovered in his presence.

The husband of my aunt is not a real uncle for me. What is the ruling for me with him?

Mahram | December 13, 2014 2:48 pm
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My family is not muslim. Is it permissible to shake hands with my cousins’ sons? They are in their 20s up to late 50s in age.
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Is it right or wrong for a daughter in law to stay in the same house as her mother in law’s husband (not her father in law as the mother in law and father in law are divorced)?