Britney Spears’ father has doubled down on the latest challenge to his conservatorship over his daughter.In new court documents, lawyers claim Jamie Spears had “dutifully and faithfully served as the conservator of his daughter’s estate without any blemishes on his record” (via Sky).Her father also said there were “no grounds whatsoever” for removing him from the conservatorship.It comes after Britney’s lawyer filed new legal documents requesting a judge boost a court hearing around her