What rights do married heterosexual couples have if they conceive with a male co-parent?

It may be that the husband in a married heterosexual relationship is having fertility difficulties and the couple choose to use a known sperm donor to conceive. In the UK there have recently been some cases challenging married couples who conceive with a known sperm donor and the donor’s right as the child’s legal father.
This is currently a very grey area of the law and therefore the law in these circumstances is not concrete and is open for challenge as the natural father may apply for rights to the child’s upbringing and likewise the natural father may be pursued for child maintenance. In most cases, if you conceive at home and are married both the husband and wife can be named on the birth certificate as Mother and Father.This would then mean your male co-parent would not legally be seen as the Father.
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