So the calculating of this period seems to date from the promise to Abraham to the deliverance of the children, which makes 430 years that included 'and of their fathers'.

...................To the birth of Isaac was 25 years. From the birth of Isaac until the birth of Jacob was 60 years.

...............................Jacob was 130 years old when he entered Egypt. This amounts to about 220 years, add 210 to it and it make 430 years of sojourning from Abraham to the deliverance from Egypt.