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我代一老夫妇问的。老大爷年事已高，行动不方便。。。老太太还算健康。他们想帮老大爷的弟弟及孙女儿办探亲，好让他们能方便过来给他两送终（十年以内）。
-Apply for B-2 visa. Also read these links for extra requirement for the kid:
https://help.cbp.gov/app/answers/detail/a_id/268/~/children---child-traveling-with-one-parent-or-someone-who-is-not-a-parent-or
https://help.cbp.gov/app/answers/detail/a_id/449/~/traveling-with-children---minors-under-18-years-of-age-traveling-to-another