In Jainism, particularly among Shwetambar Jains, the concepts of Kuldevi (family goddess) and Kuldevta (family deity) are often present due to regional and cultural influences, though strictly speaking, Jain philosophy emphasizes worship of the Tirthankaras and not of deities or folk gods. However, many Jain families, especially in Rajasthan and Gujarat, still maintain traditions of Kuldevi/Kuldevta worship as a matter of family and community tradition.

For the Doshi gotra among Shwetambar Jains:

• Kuldevi: You have mentioned "Ku Devi" (Nama Mata) as your family's Kuldevi, which is consistent with many Jain families in Rajasthan who venerate various local goddesses as Kuldevi.
• Kuldevta: The worship of Khetlaji (whether Sewari Khetlaji or Dujana Khetlaji) is more commonly associated with certain Rajput and Hindu communities. Among Jains, this practice can vary by region and family tradition.

In the Doshi gotra, especially if your ancestral village is Sewari:

• If your family tradition recognizes Sewari Khetlaji as Kuldevta, then it is customary to follow that. This is often determined by the village of origin or long-standing family practice.
• Dujana Khetlaji is another form worshipped in a different region; the selection typically depends on the ancestral village association.

Summary (based on Jain tradition and cultural practice):

• Jain scriptures do not prescribe worship of Kuldevta/Kuldevi, but cultural practices exist.
• For Doshi gotra from Sewari, Sewari Khetlaji would traditionally be recognized as the Kuldevta if that is your family's tradition.
• It is best to follow the tradition as maintained by your elders and community.

Note: Jain worship and rituals should primarily focus on the Tirthankaras and Jain philosophy, and practices involving Kuldevta/Kuldevi are more about family and cultural continuity rather than core Jain religious doctrine.

If you need further details, it is advisable to consult elders in your family or your community's Jain Samaj for precise and traditional answers specific to your lineage.