Why does "ñuhe" and "ñuha" hve different endings?? I have even seen more like "ñuhys" or "ñuhi"
Adjectives agree in gender, case and number with the noun they modify. Their declension is similar to that of nouns, (with some small differences, and variable gender, but that's for another lesson :D).
The words for father and mother, kepa se muña, are declined as following:
kepa, muña (nominative, singular)
kepi, muñi (nominative, plural)
kepe, muñe (accusative, singular)
kepī, muñī (accusative, plural)
For the lunar class, nominative and accusative possessive adjectives are as follows:
ñuha - my (nominative singular)
ñuhi - my (nominative plural)
ñuhe - my (accusative singular)
ñuhī - my (accusative plural)
Given the fact that kepa and muña are lunar type nouns, their endings will change accordingly. In this sentence, my father is the subject of the sentence, so it is in the nominative case (singular, since is a single person) => we will use ñuha (kepa). Whom does my father loves? My mother, mother being in the accusative case (singular, since is a single person) => we will use ñuhe (muñe).
You can find more info here: https://wiki.dothraki.org/High_Valyrian_Adjectives#Class_I; you have to take the word "Ñuha" and decline it as "Kasta" for the specific case/gender/number you want.
Sȳz biarves se geros ilas! (Good luck and good bye)