Bradshaigh was baptised on 21 March 1705 at
Rufford, Lancashire. She was born with the last name of Bellingham - her parents were Elizabeth, (born Spencer) and some-time lawyer William Bellingham. She and her sister
Elizabeth were her father's co-heirs and they shared their childhood home with Elizabeth Hesketh who was their mother's daughter from her first marriage. Her father's family home had been
Levens Hall in Westmoreland until this was sold in 1688 as a result of the over spending by her paternal uncle, Alan. Her father's finances were transformed when he married her mother. ==Private life==