Answer:
(Fatwa: 1784/1394/D=1431)
Your mother was divorced with three mughallazah talaqs (irrevocable talaqs) as a result of the writing of three talaqs that your father sent to her. Talaq given in the state of pregnancy takes place as well. Their nikah ended completely. After childbirth, her iddah will be over.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
