The Hindu Succession Act, 1956
2. Application of Act.—
(1) This Act applies—
(a) to any person, who is a Hindu by religion in any of its forms or developments including a Virashaiva, a Lingayat or a follower of the Brahmo, Prarthana or Arya Samaj;
(b) to any person who is a Buddhist, Jaina or Sikh by religion; and
(c) to any other person who is not a Muslim, Christian, Parsi or Jew by religion unless it is proved that any such person would not have been governed by the Hindu law or by any custom or usage as part of that law in respect of any of the matters dealt with herein if this Act had not been passed. Explanation.—The following persons are Hindus, Buddhists, Jainas or Sikhs by religion, as the case may be:—
(a) any child, legitimate or illegitimate, both of whose parents are Hindus, Buddhists, Jainas or Sikhs by religion;
(b) any child, legitimate or illegitimate one of whose parents is a Hindu, Buddhist, Jaina or Sikh by religion and who is brought up as a member of the tribe, community, group or family to which such parent belongs or belonged;
(c) any person who is a convert or re-convert to the Hindu, Buddhist, Jaina or Sikh religion.
WHEREAS
THE INDIAN SUCCESSION ACT, 1925
4. Application of Part.—This Part shall not apply if the deceased was a Hindu, Muhammadan, Buddhist, Sikh or Jaina.
In Nutshell: - Maker/Author of Will - As per Hindu succession act the Maker/Authoof the Will, should be of Hindu Whereas per the Indian Suceesin act the Maker/Author of the shall not apply if the deceased was a Hindu, Muhammadan, Buddhist, Sikh or Jaina.
And Section 30 - Interprets - the Beneficiaries of will, not be a Hindu [even out of family member], it might be of choice of the maker.
This is my interpretation of will as per 'The Hindu Succession Act' & 'The Hindu Succession Act'..