Help translate these two sentences with 也未必 and 更何况 有时就连你的父亲也未必信得过，更何况是陌生人。
有时连陌生人你也可以相信，更何况是你的父亲。


The challenging parts for me are 也未必 and 连…更何况.
有时就连你的父亲也未必信得过，更何况是陌生人。


Sometimes you can't even trust your father, not to mention a stranger.


  有时连陌生人你也可以相信，更何况是你的父亲。


Sometimes you can even trust a stranger, not to mention your father.

I think even...not to mention would be a proper translation for 连...更何况, 也未必 is just a word indicate that the sentence is negative.