Hindu Succession Act vs Hindu Marriage Act

Yeh sawal CLAT ke paper mein aaya tha last year, main khudko bahut pareshan kiya tha. Pehle tareeke se sochne par, main socha kya IPC aur BSN mein ACTUALLY kya fark hai.

Question tha: Kisi Hindu Shetra mein ek mahila ka vivah Hindu marriage act ke tehat hua, lekin uske pati ka kaatil hata hua (Section 5(i)). Pati ka katle hata hone ke baad, patni ke maa baap ne apne putra ke vartmaan vivah ke liye court mein case darj karwaya (Section 6). Is case mein, kya Hindu Succession Act ya Hindu Marriage Act ka upyog hoga?