sentence1: He married Agnes Theodora Walther , the daughter of Vilhelm Theodor Walther ) , in 1881 and his son is the botanist and sketch artist Vagn Petersson .
sentence2: He married Agnes Theodora Walther , daughter of Vagn Petersson in 1881 , and his son is the botanist and sketch artist Vilhelm Theodor Walther .