WHO IS THE real mother: the woman whose blood the child carries, or the woman who carried the child? That’s the question at the center of ‘Sa Piling Ni Nanay,’ GMA Network’s new family drama about surrogacy, and it’s bringing three familiar faces back together. Yasmien Kurdi, Mark Herras, and Katrina Halili, alumni of the first batch of ‘Starstruck,’ GMA’s reality talent search, reunite in the series, which premieres June 27 after ‘Hanggang Makita Kang Muli.’