Mabilia was therefore sister of Giovanni Gaetano Orsini (Pope Nicholas III), Cardinal Giordano Orsini (died 1287), and eight other siblings.
Mabilia war daher Schwester von Giovanni Gaetano Orsini, dem späteren Papst Nikolaus III., Kardinal Giordano Orsini († 1287) und acht weiteren Geschwistern.