According to Art. 81 part 1 of the Family Code of the Russian Federation in the absence of an alimony agreement alimony payments to minor children shall be recovered judicially from children's parents on monthly basis: one third of parents' income for two child. Your alimony recovery application shall be adjudicated actionably with attraction of your husband’s first wife as a third party. It is advisable that your husband also applies for reduction of alimony payments to the child from the first marriage. In this case you and your husband’s first wife will be entitled to 1/6 of al income of your husband.