AMSTERDAM (AP) — A Dutch lesbian couple have gone into hiding with their foster son after the boy’s biological parents said on television in Turkey that they object to the pair taking care of their child.

The matter is threatening to overshadow an official visit by Turkish Prime Minister Recep Tayyip Erdogan to the Netherlands next week. Lodewijk Asscher, the Dutch vice prime minister, told reporters Friday that the issue is an internal Dutch matter and that political interference from Turkey is “inappropriate.”