We can do this with sort and uniq commands in Unix. Keep all the data in file and try below commands

cat 1.txt|sort |uniq -c
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Output would be 1 Jane B,. Squere Rd., House 1 3 John Doe, Main Street, House 1 2 Maria D., Pat street, House B 4 Mary Lou, Central Street, House 1 the numbers before name are the number of houses the person has I can still provide you the output in required format using awk