About number of marriages. There are a number of methods.
Graha in the 7th bhava shows the marriage(s) that one has to experience in this life. Check both Rasi and navamsa. Graha aspecting 7H show those who desire to marry the native. Graha having ATR/RTA or 7H will push towards marriage
Vivaha starts from Upapada and will end with nodal axis
Check Navamsa for nodal axis as well
Check navamsa from association between 8H and 12H (One marriage), 3H+12H (2 Marriage) etc.
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