Final answer:
Tom Riddle Sr. was presumably forced into a relationship with Merope Gaunt through a love potion in the Harry Potter series.
Step-by-step explanation:
In the Harry Potter series, Tom Riddle Snr. was presumably forced into a relationship with Merope Gaunt through a love potion. Merope, a witch from the Gaunt family, used a love potion to make Tom Riddle Sr. fall in love with her. The love potion caused Tom Riddle Sr. to marry Merope, but once the effects wore off, he abandoned her and their unborn child, Tom Riddle Jr.
Love potions are magical concoctions that can alter an individual's emotions and make them believe they are in love. Merope used this potion to manipulate Tom Riddle Sr. into being with her, as she was infatuated with him and wanted to start a family.
This event took place in the wizarding world of Harry Potter, and it is important to note that in real life, using love potions to force someone into a relationship is unethical and non-consensual.