胡先愿之妻叶璇娘(1876年-1950年)为厦门人。[3]其子胡威廉(William Oh)是一名医生,娶胡载坤与关馥馨(Margaret Kwan)之长女胡恂如(Olive Hu)为妻。[5][6]其女胡怡颜(Egan Oh)则嫁给了关馥馨之弟关伯谦(Arthur P. C. Kwan),她是美国作家关凯文的祖母。[7]关馥馨与关伯谦皆为中国牙医先驱关元昌的孙辈。
^Kevin Kwan. Singapore Revisited. [2019-04-21]. (原始内容存档于2019-04-21). The young lady seated at the far right is Margaret’s eldest daughter Olive Hu, who would later marry Egan’s brother William Oh, further linking the three families.
^Kevin Kwan. Singapore Revisited. [2019-04-21]. (原始内容存档于2019-04-21). Margaret Kwan Hu and her husband Dr. Hu Tsai Kuen helped to arrange the marriage of Margaret’s brother, Arthur, a recent medical school graduate from Hong Kong University, to Egan, the daughter of their neighbor Oh Sian Guan.