谈谈one’s own 名词和of one’s own 动名词

怎样把“一个孩子如果有自己的房子就好了。”译成英语呢?A.It's nice if a child can have an own room.B.It's nice if a child can have his own room.A 句为错句,own 只能在所有格词语的后边使用。例:(1)She likes to have her own way.她喜欢按自己的主意行事。例:(2)She married him of her own choice against her parents’will.