Gündüz Alp
Gündüz Alp was the father of Ertuğrul ( 13th century ) and the grandfather of Osman I , the founder of the Ottoman Dynasty . 
<triplet> Ertuğrul <subj> Gündüz Alp <obj> father <subj> Osman I <obj> child <triplet> Osman I <subj> Ertuğrul <obj> father <subj> Ottoman Dynasty <obj> family <triplet> Ottoman Dynasty <subj> Osman I <obj> founded by