Still trying to catch up on Corrie after our holiday, but the whole surrogacy thing is interesting - I found this:
"The law says that the birth mother is the natural birth mother, whether she conceived the child naturally or artificially, and therefore has parental responsibility. Thus, the surrogate has the legal right to keep the child, even if it is not genetically related to her.
Surrogacy agreements are also unenforceable in UK courts. Even if a contract has been signed and the expenses of the surrogate have been paid, it is not legally enforceable. However, in practise the court system has been sympathetic towards intended parents who try to enforce a surrogacy arrangement.
The surrogate will be the legal mother of the child unless or until parenthood is transferred to the intended mother through a parental order or adoption of the child after the birth. As for who the father is, this is more complex. If the woman bearing the child is married, her husband is the father. The only exception to this is if he does not consent to having his name on the birth certificate. If he does not want to be named as the child’s father then the man who helped conceive the child can be named on the birth certificate. The other alternative is to transfer parenthood through a parental order or an adoption order, as with the mother. If neither person in the commissioning couple is genetically related to the baby, they cannot apply for a parental order and adoption is the only option available.
- See more at: http://solicitors.contactlaw.co.uk/family-law/what-are-the-laws-on-surrogacy"
So Tina could keep the baby. I don't think there is a genetic pull, as several GNs have pointed out, but how very, very hard for all concerned.