Oh boy, there’s extra pleasure in the Duggar household!The Arkansas household, stars of the TLC fact convey “19 Kids & Counting,” announced the delivery of their 1/3 grandchild, a son for Josh and Anna Duggar. Josh, 25, is the oldest of Michelle and Jim Bob Duggar’s 19 children.Marcus Anthony Duggar arrived on Sunday weighing 9 kilos and 3 ounces. He joins siblings Mackynzie Renee, three, and Michael…