CREATE TABLE person (...);
CREATE TABLE company (...);
CREATE TABLE ownerof (...);
CREATE TABLE transaction (...);
CREATE TABLE account (...);

CREATE PROPERTY GRAPH financial_transactions
    VERTEX TABLES (person, company, account)
    EDGE TABLES (ownerof, transaction);

SELECT owner_name,
       SUM(amount) AS total_transacted
FROM financial_transactions GRAPH_TABLE (
  MATCH (p:person WHERE p.name = 'Alice')
        -[:ownerof]-> (:account)
        -[t:transaction]- (:account)
        <-[:ownerof]- (owner:person|company)
  COLUMNS (owner.name AS owner_name, t.amount AS amount)
) AS ft
GROUP BY owner_name;