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This source makes Robert, the father of Isabella, also the father of Emma and Cecilia. (It is from Mich. 12 Ric. 2, or 1388.)
This source makes Robert, the father of Isabella, the brother rather than father of Emma and Cecilia. (It is from Mich. 15-16 Edw. 1, or 1287.) It is assumed that the earlier pedigree is more accurate.