Sentence:  Or suppose an inquest were taken between us, and it were found that they are <WSD>muliers</WSD>, for which reason the voucher stood, and they came and pleaded the same exception to escape from warranting as heirs, then two inquests would be taken... 
Meaning of the word marked with <WSD> tags:  Lawful issue born in wedlock, in distinction from an elder brother born of the same parents before their marriage.