What does it means in englishهههههههه سيخو دا يبقي ابن عمي?

The phrase "هههههههه سيخو دا يبقي ابن عمي?" is in Arabic. It translates to:

"Hahaha, so he's my cousin?"

The "هههههههه" represents laughter, and the rest of the phrase expresses surprise or disbelief that someone is their cousin.