If what you are asking for is that, after claimant with family were arrested at port of entry for making a political claim at USA-Canada land border? First, it's illegal to cross the border without proper authorization. Second, under the safe third country agreement, refugee claimants are required to request refugee protection in the first safe country they arrive in, unless they qualify for an exception to the Agreement. Exceptions to the Agreement consider the importance of family unity, the best interests of children and the public interest. Even if you qualify for one of these exceptions, you must still meet all other eligibility criteria of Canada’s immigration legislation.
CBSA officers can also detain a foreign national if: they have reasonable grounds to believe the person is unlikely to appear for an immigration proceeding (e.g., examination, hearing, removal), a danger to the public or unable to satisfy the officer of their identity.
The BSO will let you know your legal right to a counsel and will provide you with a directory to reach a lawyer or legal representative.