In Jain tradition, the ideal way is:

• The Varshitap-doer (tāpkārī) should take parnā (break the fast) from a Jain monk or nun, if possible.
• If no sādhujī / sādhvījī is available, then:

- From a brahmachārī / brahmachārinī (lifelong celibate, very disciplined), or - From a highly disciplined, samyak-drashti śrāvak/śrāvikā who follows Jain vows carefully (no intoxicants, strict veg, regular pratikraman, etc.).

Why? Because Varshitap is inspired by Bhagwān Ṛishabhdev, who broke his long fast from Shreyāns Kumār, a pure-hearted donor. The purity and character of the person offering parnā is considered spiritually important, not their social status or relation (parent, spouse, etc.).

Common practice (both Śvetāmbara & Digambar):

• Try your best that a sadhu/sadhvi gives sugarcane juice (ikshu-rasa) or other parnā-dravya.
• Family members may assist (holding vessel, serving, organizing), but they are not primary “givers” if a monk/nun is present.
• If no renunciates are available, the most vinayī (humble), sāttvik and dhārmik person in your reach is chosen.

If you want full details of Varshitap and its parnā, you can read more here