答案：C

题目分析：考查主谓一致。本句主语是The father as well as his three children，谓语动词与the father保持一致，故使用单数形式。根据every Sunday说明使用一般现在时，故C正确。

点评：对number的用法要注意。A number of修饰可数名词复数形式，谓语动词用复数；the number of…的数量；做主语。谓语动词用单数形式。