Visa for Dependent

I want to ask one question on visa validity, if some one have confirm answer on this please suggest.

My son has got visa for 2 years and he left country in June 2016. Now he will be away from country for almost a year ( more than 180 days ) and plan to be here again in Holidays.

Will his visa be valid or it gets cancelled automatically after 180 days.

His visa is punched in his passport as dependent visa, but no residency card as he is 7 years old only.

Let me know.

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