I saw this post, and asked my father some of your questions. His father, Burton Ankers (RAF 1893-1939), was Belle's brother. He had two other brothers, George (died before age 10) and John (Jack) Ankers (died 1916 RAF). Their parents were Alice Williams Ankers and David Ankers.
My father moved to Canada and then the US in the 1950s. He knew both his cousins Molly and Joan, her older sister. He corresponded with Joan Wright for many years, until a letter was returned marked "deceased'. They had a brother, Julian Wright, who was born at Rose Cottage in 1939 when Belle was 50. My father was in Tattenhall and visited her at Rose Cottage right before she gave birth. He didn't know too much about Molly and hadn't heard about her daughter. Joan never married, but had a son with the surname Taylor. Joan lived in Chester.
He remembers going to Rose Cottage in Tattenhall. It was just outside the main road from the village, and a little laid back from the road. He returned there in 1995, and he said there is now a bottling plant across the road from where the cottage was. My grandfather was a pilot, and we have a 1930s aerial photograph of the area.
David Ankers ran the Sportsman's Arms in Tattenhall for several years. One of my grandfather's aerial photos was on the wall there when I visited some time ago. I have a photo of my grandparents and Belle dressed up in costume at the pub.