Sentence:  Henrietta , however , was at that time engaged in a lengthy correspondence with Joe 's older and more serious brother , Morris , who was just about her own age and whom she had got to know well during trips to <WSD>Philadelphia</WSD> with Papa , when he substituted for Rabbi Jastrow at Rodeph Shalom Temple there during its Rabbi 's absence in Europe . 
Meaning of the word marked with <WSD> tags:  the largest city in Pennsylvania; located in the southeastern part of the state on the Delaware river; site of Independence Hall where the Declaration of Independence and the Constitution were signed; site of the University of Pennsylvania