Abdullah bin Hamad bin Khalifa Al Thani
He is the son of the 7th and former Emir , Sheikh Hamad bin Khalifa Al Thani , and a younger half-brother of the 8th and current Emir , Sheikh Tamim bin Hamad Al Thani . 
<triplet> Hamad bin Khalifa Al Thani <subj> Tamim bin Hamad Al Thani <obj> child <triplet> Tamim bin Hamad Al Thani <subj> Hamad bin Khalifa Al Thani <obj> father