He or any of the persons mentioned below should not own any accommodation at the place where he is employed or carries on his business or profession.

a.   Spouse

b.   Minor Child (includes step minor child as well as adopted minor child)

c.    HUF of whose the assessee is a member.

No, one of the condition to claim deductiion u/s 80gg is that assesee or his spouse should not own any house at the place he ordinarily resides

No, he cannot claim deduction u/s 80 gg ...as he owns a residential flat in the same place where he is living on rent :)

he cannot claim deduction u/s 80GG...... 

agree with all.