Worldwide, the proportion of male births is about $0.51$. Autoimmune thyroid disease (AITD) occurs more often in females than in males. Researchers wondered whether families with a child who has AITD have a different male-to-female ratio among siblings compared to the general population. They collected records from families with a child diagnosed with AITD. Among the cases, $30$ were male and $70$ were female. The $30$ male AITD cases had $28$ male siblings and $25$ female siblings. The $70$ female AITD cases had $60$ male siblings and $72$ female siblings.
If there are a total of $28+60=88$ male siblings in the study, how many female siblings are there?