In Jainism, the answer depends on what you mean by “allowed” and what you keep as your main focus.

1. According to Jain doctrine (shastra viewpoint)

- The real object of worship is: Arihant, Siddha, Acharya, Upadhyaya and Sadhu (Panch Parmeshthi), especially the Tirthankaras. - Worship of any devi–devta (including kuldevi) is not a path to moksh and is not prescribed as a main religious duty in Jain scriptures. - So from pure Jain philosophy, your bhakti and main puja should be only towards Tirthankaras and Panch Parmeshthi.

1. Kuldevi worship in actual Jain society

- Many Jain families (specially in Gujarat, Rajasthan etc.) do keep a kuldevi / kuldevta tradition due to family and regional culture, not due to shastra. - Such worship is seen as a family custom, not central Jain dharma. - Different gotras and regions have different kuldevis; there is no single Jain kuldevi fixed by agama.

1. Is it “allowed” or “forbidden”?

- If kuldevi worship: - does not involve himsa (animal sacrifice, alcohol, etc.), - does not replace or reduce respect for Tirthankaras, - is done only as a secondary, family custom, then many Jain acharyas and elders treat it as a tolerated cultural practice, not as ideal sadhana. - What is clearly wrong from a Jain point of view is: - giving more importance to kuldevi than to Tirthankaras, - believing kuldevi gives moksh, - doing practices that go against ahimsa.

1. Practical guidance

- Keep your śraddhā and daily worship centred on Tirthankaras and Jain principles (ahimsa, satya, aparigraha, etc.). - If your family has kuldevi tradition and you choose to follow it: - treat it as a family/cultural ritual only, - keep it simple, ahimsa-based, and - never compromise Jain vows and principles for it. - When in doubt, follow guidance of a knowledgeable Jain guru/acharya of your own tradition (Digambar or Shwetambar).

So:

• Core Jainism does not promote kuldevi worship.
• As a secondary family custom, without himsa and without overshadowing Tirthankaras, it is socially seen in many Jain families, but it is not a part of the main Jain dharma or the path to liberation.