Probate  Executrix overseas-Locus standi to bring claim –Affidavit evidence- Whether hearsay and inadmissible- Whether equitable mortgage valid –Whether promissory note enforceable-Interpretation of promissory note-Whether “on or before” sufficiently certain- Whether promise made by testator prior to his death enforceable against estate – Whether debt discharged –Whether equitable mortgage enforceable against non-parties to the loan- Whether equitable mortgagors estopped- Undertaking-Whether attorney at law in breach.