语法分析这个句子it was who stayed with my parents till they died.

i am the only daughter in our family 简单句
and 并列连词
it was I who stayed with my parents till they died.强调句型

呵呵,如果没有补充句,分析起来还真有些不知所云
并列复合句构
解析如下:
I am the only daughter in our family and it was who stayed with my parents till they died.
(1)It was ....绝对不是一个强调句构.理由很简单.
强调句构形式如下:
"It was/is + 强调部分 + that /who(强调人时可用) ...."
从上可以看出如果看成是强调句构,提问者所给句子没有"强调部分"即强调内容.
(2)"it"是指示代词,替代前句中的“the only daughter”
who 引导表语从句且在从句中作主语,其状语是由till引导的时间状语从句来充当.
全句译：我是家里唯一的女儿,也是陪伴父母终老的"那个人"。

P.S
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你这句句子有问题，正确的应该是“I am the only daughter in our family and it was me who stayed with my parents till they died.”“it was me who stayed with my parents till they died”是一句定语从句，“it was me”已经是一个完整的句子，后面的“who stayed with my parents till they died”只是用来修饰me，说明我的情况。
注意在你的问题中你少了宾语。

这是谁跟我的父母住到他们去世...
这句话是定语从句...

后面who指的是前者也就是&