Upvote:2
As the child entered Australia accompanied by both parents and grandparents, departing with the latter shouldn't be an issue, nor should airside transit points. Should the child's visa only reference the parents, it may be a good idea to add a photocopy of their passports' identity page to the consent letter.
While they may not be on a Quantas flight, this advisory is helpful:
Accompanying adult must write the full name of the child on the reverse of the adult's boarding pass, so that the minor can be linked to the accompanying adult and their identification.
As for arrival home, portions of the AirIndia for Minors travelling with passengers other than their natural parents are a good guide (although not all might be necessary).
The following should be borne in mind when a child / infant is accompanied by other adults and not traveling with their parents.
- Consent (no objection) letter/affidavit signed by both parents (draft attached)
- Photocopies of relevant pages of both parents passports
- Signatures of the parents on consent letter should match the signature on the passport
- In the rare case where the family name of the child does not match the parents', birth certificate of the child should be made available