If someone already has children and then has a child with someone who has never had children before, is that child a firstborn?

Question

If someone had their first kid with a person who had children from a previous marriage, is that child a firstborn?

If this is a real situation please make sure to speak with a qualified rabbi about the details of your particular situation when receiving a final ruling. — Double AA, Jun 22 '13 at 21:38
Not real situation Just hypothetical, but I'm sure it can apply to some. An example of use would be Pidyon Haben — Ess Kay, Apr 05 '16 at 20:32

score 6 · Accepted Answer · answered Jun 23 '13 at 13:31

Here is a summary of an answer via wikipedia

The firstborn of one's mother is referred to in the Bible (Exodus 13:2) as one who "opens the womb" of his mother. Therefore, the firstborn of the father exclusively, although considered as a firstborn regarding his father's inheritance, is not considered as a firstborn regarding the requirement to be redeemed, as the mother's womb has already been opened by his half-sibling, the firstborn of his mother. Thus, the Shulchan Aruch rules that only a first born of the mother is required to be redeemed.

Kitzur Shulchan Aruch. Translated by Rabbi Avrohom Davis. Metsudah Publishers, 1996. P. 717

If someone already has children and then has a child with someone who has never had children before, is that child a firstborn?

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