Probate - Executrix overseas - Locus standi to bring claim - Affidavit evidence - Whether hearsay and inadmissible - Whether equitable mortgage valid - Whether promissory note enforceable - Interpretation of primossory note - Whether on or before sufficient 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.