Are the questioner's children, who were suckled by her mother for two consecutive months, considered siblings to the children of the questioner's older brothers?

Your sons who suckled from your mother have become foster brothers to your brothers and sisters, due to Allah Almighty's saying: "And your foster sisters." Thus, your sons have become paternal uncles to your brothers' children and maternal uncles to your sisters' children; because what is forbidden by lineage is forbidden by fosterage, and Allah Almighty says: "Forbidden to you are your mothers, and your daughters, and your sisters, and your paternal aunts, and your maternal aunts, and your brother's daughters, and your sister's daughters."