Children and parents
An-Nisa 4:11 discusses the daughter, multiple daughters, sons and daughters together, and parents in different circumstances. Read the whole verse and identify all heirs before selecting a fraction.
Spouses and some siblings
An-Nisa 4:12 addresses spouses with or without children and some maternal-sibling cases, including a warning against harmful bequests.
Other sibling cases
An-Nisa 4:176 addresses sisters and brothers in the circumstances described there. Different sibling relationships must not be treated as identical.
The remainder in the Sunnah
Ibn Abbas’s report assigns prescribed shares first and the remainder to the eligible residuary heir. Abu Huraira’s report assigns property left behind to heirs. These are explanations; the priority of debts and valid bequests has separate evidence. The documentation page gives the Arabic wording and references.