Rule 1: 1. The suffixes on family words
Nothing new in the forms, only in the words. وَالِدٌ father and وَالِدَةٌ mother are ordinary nouns, so وَالِدِي, وَالِدَتِي; the dual اَلْوَالِدَانِ the parents becomes وَالِدَايَ my parents (nominative) and وَالِدَيَّ (genitive and accusative). Broken plurals take the suffixes like a singular: إِخْوَتِي my brothers, أَحْفَادُهُ his grandchildren; sound feminine plurals too: أَخَوَاتُكَ your sisters, بَنَاتُنَا our daughters. كُلٌّ takes them as well: كُلُّنَا all of us, كُلُّهُمْ all of them.
وَالِدَايَ يَسْكُنَانِ فِي الْقَرْيَةِ.
wālidāya yaskunāni fi-l-qaryati
My parents live in the village.
Dual + ـيَ, nominative.
ذَهَبْتُ مَعَ وَالِدَيَّ إِلَى الْمَدِينَةِ.
dhahabtu maʿa wālidayya ila-l-madīnati
I went with my parents to the city.
Dual oblique + ـيَ: ayya.
إِخْوَتِي كِبَارٌ وَأَخَوَاتِي صِغَارٌ.
ikhwatī kibārun wa-akhawātī ṣighārun
My brothers are grown up and my sisters are small.
أَحْفَادُ جَدِّي كَثِيرُونَ وَكُلُّهُمْ يُحِبُّونَهُ.
aḥfādu jaddī kathīrūna wa-kulluhum yuḥibbūnahu
My grandfather's grandchildren are many and all of them love him.
أَنَا حَفِيدَتُهُ الصَّغِيرَةُ.
anā ḥafīdatuhu-ṣ-ṣaghīratu
I am his youngest granddaughter.
The adjective takes the article after a suffixed noun.