I ran into a well-written fanfiction depicting a gloomy marriage between Angel and Liza-Lu and how Liza simply becomes an object to Angel's obligation to Tess.
Was that a happy ending Hardy intended? Would Angel eventually grow to love Liza on his own? I would think Liza would be miserable to exist as an obligation to Angel.
Also consider that Tvtropes says that it was illegal to marry your in-law during a time of religious conservatism. Though the issue seems HandWaved by Tess assuring Angel, "People marry sister-laws continually about Marlott" (chapter 58).
What do you think?

