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