No primary sources link the mother of Jesus to the mother of John the Baptist. Indeed, no primary sources even name the mothers. The gospels are written 70 yrs to a century after the events.
Primary evidence from Josephus confirms the existence of John the Baptist.
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Unknown father of Jesus is my 56th great uncle's 9th great aunt's husband's partner's 7th great
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grandfather's wife's third cousin four times removed's husband's brother's wife's partner.
Ingrīda Cinkmane (Dzelvīte) is related to Jesus :
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Jesus is Ingrīda Cinkmane (Dzelvīte)'s 56th great uncle's 9th great aunt's husband's partner's 7th great grandfather's wife's third cousin four times removed's husband's nephew
Yeshua