Explanation
To enable advisors to capture Once-in-a-Lifetime events and prevent users from accidentally creating more than one event of such an event type, the consultant should configure Unique event types. Unique event types are event types that can only be created once for each contact or individual, such as birth, death, or marriage.
By using Unique event types, the consultant can ensure that advisors can capture important life events for their customers and avoid duplication or inconsistency.

Explanation
The Financial Services Cloud capability that provides the ability to accommodate the request of sharing specific records with certain users who are not typically engaged in that account is Compliant Data Sharing.
Compliant Data Sharing is a feature that allows users to share records with other users based on criteria such as record type or field value. Users can create sharing rules for objects such as account, contact, individual, financial account role, opportunity participant role, or case team role. By using Compliant Data Sharing, the financial institution can share records with legal and compliance members who must be engaged for particular deals based on a field value that indicates the deal type.

To make sure that Scott's data is rolling up to the Adams Household, the Banker should make the Adams Household Scott's primary Group and edit the Activities & Objects to Roll Up. A primary Group is a construct in Financial Services Cloud that allows you to define the main group for a client. You can use primary Group to roll up financial data from all the financial accounts that are related to the client or the group. By making the Adams Household Scott's primary Group, the Banker can ensure that Scott's financial data is included in the household summary. The Banker can also edit the Activities & Objects to Roll Up to specify which items, such as financial accounts, goals, or referrals, should be rolled up for Scott. Verified Reference: : Salesforce Help Article 4

To configure a custom field for reporting when relating two business accounts to each other, the administrator should configure the custom field on the Account-Account Relationship object. The Account-Account Relationship object is a custom object in Financial Services Cloud that allows you to create and manage relationships between two accounts, such as Household Member, Business Owner, Trustee, or Friend. You can use the Account-Account Relationship object to store additional information about the relationship between two accounts, such as role, start date, end date, or status. You can also use the Account-Account Relationship object to report on the account-account relationships and analyze their impact on your business. Verified Reference: : Salesforce Help Article [4] : Salesforce Help Article [5]