Yes.
no....
Yes, a girl from Sandilya Gotra can marry a boy from Atri Gotra as they are considered to be of different lineage and are allowed to marry as per Hindu marriage customs.
As long as you are from different gotra marrying is possible. But religiously if you are not from the same caste you can not marry.
No they can't
Yes it is possible ,,but condition is that boy should be from sandilya and girl from kasyap....reverse is not preferable.
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Yes, Kayasth boy and girl with Kashyap Gotra can marry. Two gotras having a common pravara are not allowed to marry. For instance those of theKashyapa and Shandilya gotras cannot intermarry because they share the same sage, Asita, in their pravaras. Refer: http://www.indiancultureonline.com/details/Gotra.html
Normally Kaushal Gotra (Ascendants of SURYA) do not marry into the same Gotra - Khatri's (Kapur, Khanna, Malhotra in the same order) have been associated with Kaushal Gotra
No you cannot marry in same gotra. Its prohibited in vedas. And it also has a scientific reason yo marry in same gotra there will be a genetic disorder in offsprings.
can marry a boy beloging to kasyapa, dhanunjaya & koundinya gotras
Yes, a girl from the Kashyapa gotra can marry a boy from the Sandilya gotra. In Hinduism, marriage between individuals of different gotras is allowed as it is believed to strengthen genetic diversity and promote harmony within the family.
According to Hindu Caste System people of similar gotras can not marry. Because they will be brother and sister of each other.
yes.