"...I don't set myself up for losing by way of estoppel..."
You're worried that THEY have the power to BAR you from executing your duties as the Executor of your father's estate? :/
Printed copy · Anthology Volume 6, page 567Printed copy from The Tender For Law Anthology, Volume 6, page 567 (printed 13 June 2014). Added by this site; not part of the Facebook export.