Al smiled back, wary still, but the situation seemed... satisfactory.
"She's capable of shaking my finger," he declared with a nod. "That is acceptable. She does have a firm grip for her age."
He couldn't contain his curiosity fully, after that, so he leaned forward and... sniffed.
His finger was already claimed and he couldn't hear her, and exploring the situation using the remaining sense of taste just didn't seem appropriate for the occasion.
"Hope smells like milk." Al voiced his assessment with a small smile of an accidental discovery. "... human milk, no doubt." He peered at the baby with suspicion as the final gear clicked into place and he directed the same stare at his sister. "Your human milk," he added flatly.
"Hm. On the other hand, the by-product of secretion from your mammary glands is not something I'd rather smell too closely."