Based on the description, <span>marvin is exhibiting :Decentering
Decentering is a psychological distress that happen to someone after being replaced from the center of attention.
Before Marvin's brother is born, Marvin received the full attention from his parents. But now after his brother is born, most of the attention is given to his brother, which is the most likely reason why Marvin is upset
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Well this really depends on your needs. California, I would say, is the best state because the weather is great, it hardly ever rains, L.A. is in California, Hollywood is in California, and, if you live in San Diego, you are close to ALL types of terrain: desert, ocean, mountains, and city.
Ava is able to do this because of an improvement in selective attention. This is a mechanism to focus on a specific thing in the environment though certain amount of time.
