。
It's not like both daughters want to study abroad.
Literal
Daughters [topic-は] 2-people both [subject-が] study-abroad-want [quotative-ている] not-the-case-[わけではない].
~たがる is the third-person 'want' form — while the speaker uses ~たい, describing others' wants requires ~たがる ('to show signs of wanting'). 二人とも ('both of them') is the two-person inclusive expression. わけではない negates a stronger inferred claim.