The punctuation is right in the last one,
Tomas whispered, “I just heard Father say, ‘We are giving your brother a surprise party.’”
Answer:
The correctly punctuated sentence is:
Tomas whispered, "I just heard Father say, 'We are giving your brother a surprise party.' "
Explanation:
A single quotation mark is used in the sentence which is enclosed in double quotation marks. The ending punctuation mark is placed inside the quotation marks. Space is provided to identify the quotation marks clearly.
