This is a strange case. Possibly murder/suicide?

"Anthony and Suzette Cirigliano, both 51, and their two sons, Brandon, 19, and Noah, 15, disappeared Oct. 16 and are believed to be in a silver 2005 Toyota Sienna minivan, authorities said.
Anthony works in finance, and Suzette had been caring for her elderly mother, who suffers from dementia.
On Monday, the elderly mother was found wandering the streets of their Fremont neighborhood, which is about 45 miles north of Grand Rapids."

https://www.msn.com/en-us/news..../crime/michigan-fami