if you get the honey(love potion, also we the code have the for the honey here too in tips and tricks)and use it then connect with another tama while the hearts over your tamas head, hearts will appear on the tama that didn't take a love and they will get married and have twins. also the other...
you should take care the first generation because the same thing happened to me when i took bad care of my tama on its first generation then it died the second gen. but when i reset it and took good care of the first gen. the 2 gen was badly taken care of and the third generation is here and alive.