I would write it this way:
Je t'aime.
Papa.
I love you father = Je t'aime, (mon) père
You say "j'aime le français" to say "I love French" in French.
love in french is "amour".
To say "I love him/her" in French, you say: "Je l'aime"
My father is 'mon père' in French.
father is translated père in French.
You can say "Je l'aime" to say "I love him" or "I love her" in French.
in love in French is "amoureux de".
to love is translated 'aimer' in French
Vaterliebe du=Father love you
I love it is "j'aime / j'aime ça" in French.
"and her love" is ".. et son amour" in French.