Yes, substantial. Ja'fari inheritance organises heirs into classes where a nearer class excludes a more distant one entirely, and does not apply 'awl in the Sunni manner.
The Canadian position
Canada has a significant Shi'i population, and a will drafted on Sunni assumptions will not reflect Ja'fari shares.
The Canadian document is enforceable either way; the question is which calculation it embodies.
The Islamic position
A sole daughter may take the whole estate by radd under Ja'fari rules where Sunni schools would pass a residue to agnates.
Ask a scholar of your own school rather than working from a Sunni summary table.
The four Sunni schools are not recorded as differing materially on this point in the sources reviewed. Where your own case turns on it, put it to a scholar of your school.
General information, not legal or religious advice. Inheritance depends entirely on the exact family circumstances. Confirm the Canadian position with a lawyer in your province and any religious ruling with a qualified scholar.
Citations & sources
Every factual claim on this page traces to one of the references below. Legislation and dollar thresholds change — verify against the primary source before relying on any figure.
- Surah an-Nisa 4:11 — shares of children and parents — Quran.com
- Surah an-Nisa 4:12 — shares of spouses and uterine siblings — Quran.com
- Surah an-Nisa 4:176 — the kalalah verse — Quran.com
- Encyclopaedia of Islam — Brill
- Oxford Islamic Studies / Oxford Reference — Oxford University Press
- Research Papers — Cambridge Muslim College
- Research — Cambridge Muslim College
- Academics — Islamic law and theology curriculum — Zaytuna College
- Administering estates — Government of Ontario
- Discontinuing a will challenge ontario — Treadstone Law
- Multiple wills ontario private company shares probate avoidance — Treadstone Law
- How long does estate administration take no will ontario — Treadstone Law
- No contest clause in terrorem ontario wills — Treadstone Law
- Does common law spouse inherit without will ontario — Treadstone Law
- Lost will probate ontario — Treadstone Law
- Wills & estates practice — Treadstone Law