Should brothers do the parents' śrāddha together, or each separately?
if the family lives together, one joint śrāddha is enough; brothers living separately often each perform it.
The Dharmaśāstra digests discuss this directly. When brothers share one household, the eldest (or whoever is the kartā) performs the śrāddha and the others take part; it counts for all. When brothers have separate households — common today, often in different cities or countries — many authorities say each may perform his own śrāddha, and many families follow that.
What matters is that the ancestors are remembered with sincerity on the day. A practical pattern: the one who did the last rites does the main śrāddha with a priest; siblings elsewhere offer tarpaṇa, feed someone, or give dāna in the parent's name on the same tithi.
Sisters and daughters can join in, and they may perform the offerings themselves too. Avoid letting the question become a family dispute — the parents would wish the children to be united above all.
Source: Dharmasindhu; Nirṇayasindhu
Dharma Q&A — family & life events · Ask a Jyotishi your own question