The Grihya Sutras, Part 1 (SBE29), by Hermann Oldenberg, , at sacred-texts.com
1 1 Now (follows) the Ekoddishta (i.e. the Srâddha ceremony directed to a single dead person),
2. With one strainer,
3 3. One (pot of) Argha-water,
4. One lump (of flour).
5 5. No inviting (takes place here), nor the putting
(of food) into the fire, nor (do) the Visve devâs (take part in this ceremony). 'Relished?'thus are they to be asked whether they are satiated. 'May it approach (the fathers),' instead of 'imperishable.'
6. 'Be satisfied,' when sending them away.
7. Thus through one year, when one has died.
8 8. And (then) omission of the fourth one.
108:1 2, 1. Eka uddishto yasmin srâddhe tad ekoddishtam (Nâr.). This is the kind of Srâddha sacrifice which is to be performed for one twice-born during the first year after his death; see Manu III, 247; Yâgñavalkya I, 250.
108:3 This rule about the Argha water corresponds to those given with regard to the Pârvana Srâddha in the Sûtras 3 and 4 of the preceding chapter.
108:5 'Because the âvâhana (inviting) is forbidden here, it follows p. 109 that it must take place at the Pârvana Srâddha' (Nâr.). According to Râmakandra's Paddhati he shall say to the Brâhmanas, 'I will invite hither the fathers;' and when they give their consent, he invites them with Rig-veda X, 16, 12. Comp. Yâgñavalkya I, 232 seq., &c. Regarding the Visve devâs comp. the note on chap. 1, 2; as to the triptaprasna (the question whether they are satiated) comp. Manu III, 251; Yâgñ. I, 240. At the Pârvana Srâddha, after the Brâhmanas have finished their dinner and rinsed their mouths, and after the Pindas have been offered, the sacrificer says, 'May what has been given at this Srâddha to our father N.N., who belongs to the gotra N.N., be imperishable!' (comp. Yâgñ. I, 242.) This phrase is to be altered at the Ekoddishta Srâddha in the way indicated in this Sûtra.
109:8 After the Ekoddishta Srâddha has been performed for a dead person during the first year after his death, he is to be admitted, by the Sapindîkarana ceremony, among the other Manes, and receives thenceforward his Pinda together with them at the ordinary Pârvana Srâddha. As the ritual of this Srâddha requires that the number of the 'fathers' worshipped should be three, the accession of a new person makes necessary the omission of the pra-pra-pitâmaha, who has now become fourth among the fathers.